Some are, some aren't.

The addiction connection hasn't really been proved, as far as I nnow, with food. While there is an insulin response, I think the body can be "retrained" to respond normally to foods that once made us go nuts. This isn't something that can be done with other addictions. Just ask a recovering alcoholic.

Many of us got fat in a variety of ways and for a variety of reasons: eating high carb (pyramid) because that's what we thought were were supposed to do; bad habit; emotional eating; medical conditions.

It's not a one-size-fits all situation. Food is a complex issue because it's something we HAVE to do to survive. It's not like we can just abstain as one can from tobacco or alcohol.